I have a picco p3 engine that is perfect the only thing is that it mis fires at full throttle . It does not do it consistently but it does it lets say after a long straight etc... It seems like is starving fuel etc....

Could it be my fuel?? I have opened it in June 2009 and kept it in the garage for quite sometime before using it again last week.

Could it be the glow plug, I have an OS8 , may be I need a hot plug like a P3 .